Improvements in or relating to red phosphorus
CA 2078595 C · Owner: Rhodia Consumer Specialties Limited · Inventors: Oakley, Simon J.; Zakikhani, Mohsen; Dutton, Tom
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Evolution of phosphine from red phosphorus is reduced by means of acyclic aliphatic compounds having at least one carbon-to-carbon double bond in the, alpha-position relative to an electron-withdrawing group. A preferred example of, such a compound is trans-cinnamaldehyde.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed September 18, 1992 and granted May 28, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 18, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.